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AMBE-4020™-HDK Manual - Digital Voice Systems

1. 2 67 in 1 15 in 0 45 in Figure 21 AMBE 4020 HDK dimensions i Page 44 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 5 Specifications User s Manual Version 1 1 J11 Mate J10 Mate ke 15 qm o dy te diria lt 1 742in Figure 22 Custom External Codec Board E Page 45 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 5 Specifications User s Manual Version 1 1 Appendix 7 DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 7 1 Rate Tables Table 14 Ke AMBE 1000 Rates AMBE Vocoder AMBE 2000 Rates OBEE E AMBE 1000 Compatible Rates Rate Index Total Rate SE FEC Rate ate 0 2400 2400 0 1 3600 3600 0 2 4800 3600 1200 3 4800 4800 0 4 9600 9600 0 5 2400 2350 50 6 9600 4850 4750 7 4800 4550 250 8 4800 3100 1700 9 7200 4400 2800 10 6400 4150 2250 11 3600 3350 250 12 8000 7750 250 13 8000 4650 3350 14 4000 3750 250 15 4000 4000 0 AMBE 2000 Compatible Rates Rate Index Total Rate ort FEC Rate ate 16 3600 3600 0 17 4000 4000 0 18 4800 4800 0 19 6400 6400 0 20 8000 8000 0 21 9600 9600 0 22 4000 2400 1600 23 4800 3600 1200 24 4800 4000 800 25 4800 2400 2400 26 6400 4000 2400 a R Page 46 DVSI Confidential Propri
2. UART Serial Port Pin Out Pin Signal Name Both Switch 1 and Switch 2 Both Switch 1 and Switch 2 Number Se o in Position 1 in Position 2 2 Tx Channel Out Rx Channel In 3 Rx Channel In Tx Channel Out DVSI Confidential Proprietary Page 41 AMBE 4020 HDK Development Board User s Manual Version 1 1 USB Serial Port P6 Section 5 Specifications Type Serial Connector Mini USB B SMT USB Pin Out Pin Number Name 1 USB 5v 2 D 3 D 4 ID 5 Connected to Ground 6 7 8 9 Shield 6 3 Audio I O Connections Line In J8 Type Single ended Input Connector female 3 5mm Audio Jack Maximum Input Level 1 41 Volts RMS Input Impedance 10 ohms nominal Bandwidth 20 Hz to 4 kHz up to 48 kHz available D A Resolution 16 bits D A Sampling Rate 8 kHz up to 96kHz available SNR Non Weighted 81 dB Note A 1 414 V signal on the line input produces digital max when the codec input gain is O dB Line Out J7 Type Single ended Output Connector female 3 5mm Audio Jack Maximum Output Level 1 0 Volt RMS Output Impedance lt 50 Ohms Bandwidth 20 Hz to 3 6 kHz up to 48 kHz available A D Resolution 16 bits SNR Non Weighted 84 dB A D Sampling Rate 8 kHz up to 96kHz available Minimum Load 10k Ohms nominal Handset
3. HDK Development Board operates with a 5 0 V DC power supply Simply plug in the 120 V AC to 5 0 V DC 1 A power source provided with the HKD into an AC power source and the DC power receptacle P2 Figure 3 DC Power 5V 1 A i EZ vio SAR gt ME ae e eo mm s uu III UI pn 4 Power LEDs 2 2 2 RS 232 UART Connection The RS 232 UART connection P5 RJ45 connector on the HDK board is the Input Output that can be connected to another HDK board s P5 connector for full duplex communications between two HDKs or it can be used to interface to another device The data transmitted or received consists of raw voice data Page 5 DVSI Confidential Proprietary AMBE 4020 HDK Development Board E Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 without any extra control data other than start stop bits and an idle period between voice frames The baud rate is determined by the vocoder bit rate selected such that the idle period between voice frames will be approximately 10 bits in duration To connect two HDK boards together via the RS 232 UART the device EEPROM must be configured for on of the Dual HDK modes RS232PTT RS232ENC or RS232DEC Additionally switch the UART switches SW1 and SW2 to position 2 on only one of the two boards Then connect a CAT 5 Standard Ethernet cable to each HDK board P5 connector to communicate Each board converts the
4. DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists AMBE 4020 HDK Development Board Version 1 1 May 2015 User s Manual AMBE 4020 HDK Development Board User s Manual Version 1 1 May 2015 O Copyright 2014 Digital Voice Systems Inc 234 Littleton Road Westford MA 01886 The most up to date version of the manual is always available at www dvsinc com This document may not in whole or in part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without prior consent in writing from Digital Voice Systems Incorporated Every effort has been made to ensure the accuracy of this manual However Digital Voice Systems Inc makes no warranties with respect to the documentation and disclaims any implied warranties of merchantability and fitness for a particular purpose Digital Voice Systems Inc shall not be liable for any errors or for incidental or conseguential damages in connection with the furnishing performance or use of this manual or the examples herein The information in this document is subject to change without notice Trademarks AMBE 4020 HDK Development Board and AMBE 4020 Vocoder Chip are trademarks of Digital Voice Systems Inc AMBE is a registered trademark of Digital Voice Systems Inc Other product names mentioned may be trademarks or registered trademarks of their respective companies and are the sole property of th
5. 0xC 0xB OXA 0x9 or 0x8 with OxF being the most confident 1 and 0x8 being the least confident 1 If a soft decision bit file is derived directly from a hard decision bit file then each bit will have maximum confidence and will be equal to either 0x0 for O or OxF for 1 If the 16 bits a b c d e f g h i j K m N 0 p are the first 16 bits stored in a hard decision bit file Then the first eight bytes of the converted soft decision format file will be binary If each of the 16 4 bit soft decision bits are denoted as A B C D E F G H I J K and L then the first eight bytes of the file could be expressed as hex AB CD EF GH IJ KL MN and OP A through P are each 4 bit soft decision bits in the range from 0x0 to OxF If the transmission is not ideal then the values for each 4 bit soft decision bit will vary between 0x0 and 0xF depending upon the confidence of each received bit a b c d e f g h i j K I m N O p are the first 16 bits stored in a hard decision bit file Then the first sixteen bytes of the converted soft decision file will be binary 0000aaaa 0000bbbb 0000cccc 0000dddd 0000eeee 0000ffff 0000gggg 0000hhhh 0000iiii 0000jjjj 0000kkkk OOOOIII 0000mmmm 0000nnnn 00000000 0000pppp or hex OA OB OC OD OE OF 0G OH Ol OJ OK OL ON 00 OP Page 48 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 5 Specifications
6. 6 1 END USER shall maintain and not remove any copyright or proprietary notice on or in the PRODUCT 6 2 Reproduction of non proprietary information found in DVSI Users Manuals or data sheets is permissible only if the END USER reproduces without alteration and includes all copyright and other proprietary notices all associated warranties conditions and limitations on all copies in any form 7 Proprietary Information AMBE 4020 HDK Development Board Information Section User s Manual Version 1 1 7 1 The parties agree that the PRODUCT shall be considered Proprietary Information 7 2 Except as otherwise provided in this Agreement END USER shall not use disclose make or have made any copies of the Proprietary Information in whole or in part without the prior written consent of DVSI 8 Limited Warranty 8 1 DVSI warrants the PRODUCT to be free from defects in materials and workmanship under normal use for a period of ninety 90 days from the date of delivery The date of delivery is set forth on the packaging material in which the Product is shipped This limited warranty extends only to the Customer who is the original purchaser If the PRODUCT is found to be defective and the condition is reported to DVSI within the warranty period DVSI may at its option repair replace or refund of the purchase price of the PRODUCT DVSI may require return of the PRODUCT as a condition to the remedy Restrictions This
7. When the HDK is not connected to a PC it is automatically configured as specified by the EEPROM HDK Device DVY1FYDS HDK4020 Version Beta Dec 16 2014 11 21 24 AMBE4020 Version Release 00100 08 14 14 Figure 20 HDK 4020 Control Panel Note If the reset button on the HDK is pressed it is recommended to restart the hdkcontrol 4 6 1 HDK Options 4 6 1 1 Mode e USBPACKET _ In this mode the user may encode decode files via the USB interface using hdk4kclient exe RS 232 is not used fo this mode e RS232ENC In this mode the encoder is functional and produces channel packets every 20 ms on the RS 232 UART interface e RS232DEC In this mode the decoder is functional and expects to receive channel packets every 20 ms via the RS 232 UART interface During time intervals in which the decoder does not receive channel packets it produces comfort noise e RS232PTT In this mode push to talk codec mode is enabled The encoder and or decoder run depending upon whether the PTT button S2 is depressed The encoder runs while S2 is depressed While S2 is depressed RS 232 UART transmit data is active on P4 See Push to Talk DEC Sub Option and Push to Talk Mode PMODE Sub Option for additional configuration when this mode is selected 4 6 1 2 Input This selects the desired speech input source e I2S AIC14 HANDSET Selects the AMBE 4020 25 interface as the speech input interface to the AMBE 4020 and chooses the Handset jack on the o
8. 0 MHz CLOCK XI 1 8 VOLTS ExT 5 0 VoLTS picit TR REGULATOR POWER IN HANDSET SES L DMIC_CLK FER DMIC_RX ER ie ie O ve CoDEC BOARD CONNECTOR 3 5 VOLTS REGULATOR JII U8 Figure 1 Basic block diagram of the AMBE 4020 HDK board Page 3 DVSI Confidential Proprietary AMBE 4020 HDK Development Board h Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 SWI AND SW2 AMBE 4020 DAUGHTER CARD VOCODER CHIP CONNECTOR USB UART HEADER RESET ANALOG IN PUSH TO T ALK SWITCH ANALOG OuT 5V DC POWER HANDSET HEADER DIGITAL HANDSET DAUGHTER CARD CONNECTOR Board Connections Item Name Connector Type Description P2 DC Line In Power Receptacle 5 Volts DC P3 USB Mini USB B SMT PC Connection P1 Handset RJ 11 Full Duplex Communication J7 Audio Output 3 5 mm Plug Speakers J8 Audio Input 3 5 mm Plug Microphone P5 UART Serial Port RJ 45 Packet Data to rom AMBE 4020 Vocoder Chip P4 Digital Handset RJ 45 Packet Data to from MSP Table 1 HDK Connectors Page 4 DVSI Confidential Proprietary AMBE 4020 HDK Development Board h Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 ERR HDK UART Serial Power Connector Interface Figure 2 HDK Power UART Serial Connection and PC USB Interface 2 2 HDK Power and Interface Connections 2 2 1 DC Power P2 The AMBE 4020
9. 115200 230400 460800 and 921600 but any value lt 921600 can be specified as long as it provides enough through put for the data that must flow Typically baud rates of 172800 or higher are used for packet mode due to the larger size of speech packets 3 R Page 24 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 Typically baudrates lt 115200 baud should be used for codec mode in order to conserve power Using a large baud rate during packet mode allows processing at a rate that slightly exceeds real time be lt baud rate gt Specifies the baud rate used after processing the vector Prior to exiting but before setting the final power mode see lpme the baud rate can be changed This is typically used in conjunction with lpme to reduce the baud rate prior to entering a lower power mode lpms lt power mode gt Specifies the power mode that is entered at the start of the command The power mode of the AMBE 4020 is set as specified by sending PKT_PMODE see AMBE 4020 User s Manual When power mode is O 1 or 2 then the AMBE 4020 operates at full power although it still consumes little power when no packets are being sent or received lt power mode gt 1 or 2 do not have any use in conjunction with hdk4kclient since they specify how power is conserved during push to talk codec mode In packet mode or in codec mode lt power mode gt 1 or 2 behave the same
10. 17 hdk4kclient exe options n nc YL AL LLE REE Ea aaa anne a antas an EREE 23 Table ISVocoder Pal S Mn ii O ad GG ua ete 1 Yd Wd Fu la 47 List of Figures Figure 1 Basic block diagram of the AMBE 4020 M HDK board es 3 Figure 2 HDK Power UART Serial Connection and PC USB Interface 5 Figure a DO Powern bV Aia AA FFF A A 5 Figure 4 Power LEDS iii ii evita avid ava ld av ee dines 5 AMBE 4020 HDK Development Board Section Table of Contents User s Manual Version 1 1 Figure 5 Board Audio Connections nnr Yn HYLL LLC LL LLLL LL LLLL HYLL LLY ELLYLL LA LLEN HY nana unarne nana 7 Figure 6 Analog Audio IO Selection Jumper 8 Figure 7 Switches SW1 SW2 and S1 reset S2 Push to talk a 9 Foure S LED LOCA ION cdta 13 Figure 9 Reset SWiteh SI iii 14 lte Le RE 14 Figure 11 Installing driver software indicator nn YHA YLLL LLY Y crac 15 Figure 12 AMBE 4020 HDK Board drivers are installed and ready to use s 16 Figure 13 Windows Device Manager showing the AMBE 4020 HDK on COM 15 16 Figure 14 SW1 and SW2 shown in Position T eeieie irn reatar LLY FFF LLD non 30 Figure 15 HDK1 in RS232ENC Mode nn LLYR HL LLYR rn rra 31 Figure 16 HDK 2 in RS232DEC Mode 31 Figure 17 Both HDK 1 and HDK 2 in RS232PPT Mode arara 32 Figure 18 Transmit and Receive LEDS erre nn nr nano rra r ran rra 32 Figure 19 Cont
11. 8 PHono SW2 pa AMBE 4020 RESET VOCODER CHIP HCONTROLLER SWITCH gt KIODXIZ8VLF5 S DIGITAL DECODER VocoDER RESET HANDSET E PTT RJ45 SWITCH S2 Figure 17 Both HDK 1 and HDK 2 in RS232PPT Mode Figure 18 Transmit and Receive LEDs 4 6 HDK4kcontrol exe User Interface DVSI provides a GUI interface software hdk4kcontrol exe that is used along with the DVSI server program dvsiserver32 exe for a fast and easy way to configure and control each HDK in an HDK to HDK communication link a A Page 32 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 HDK 4020 Control Panel Se HDK Device DVY1FYDS HDK4020 Version Beta Dec 16 2014 11 21 24 AMBE4020 Version Release 00100 08 14 14 HDK Options Push toTalk Mode Options Skew Control Options v Power PMODE 2 Sleep v 7 Enable Skew Control DEC ENC 4 RX v IFRAME Hz 50 0000 Vocoder Bit Rate 29 9600 bps 2400 Voice 7200 FEC AMBE2000 Compatible Enable Noise Suppression Model IDEAL aa DTMF y Enable DTX ype Level Duration ms 100 sn ct gala ST Min 321 Max 262 ST Min 32767 Max 32768 D D Ls ls LT Min 865 Max 1404 LT Min 0 Max 0 caroge 7 ke La Je mann as XMT Level dBm0 XMT Single Tone Index 3 2990900400 O E DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists Figure 19 Control Software window Prior to launching hdk4
12. Board Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 SECTION Connectors Test Points amp Indicators 2 DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 2 1 Overview of HDK Interfaces The AMBE 4020 HDK is designed with flexibility in mind It provides a variety of interfaces that allow for fast and easy integration and testing The AMBE 4020 HDK can be used as a standalone development tool or be connected to another AMBE 4020 HDK via the UART channel interface to demonstrate its capabilities as a half duplex real time communication system With a PC the board can encode speech data from the handset 3 5mm stereo jack Line In input connections or it can process speech files from a PC USB connection When connecting two boards together the RS 232 UART interface acts as the channel for the compressed voice serial data bit stream DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists ANALOG OUT 1 8 PHONO USB TEST POINTS CONTROLLER USB J3 us Copec BOARD CONNECTOR e UART elw SWITCH RS 232 UART J7 PKT HEADER TRANSCEIVER Sieg Ji Es UART em SWITCH SW2 JACK HANDSET l O RJIl UART CHANNEL HEADER J2 a AMBE 4020 CONTROLLER vo RCA oR HANDSET VEDERE P KIODXIZ8VLF5 HEADER 5 VOCODER RESET ve RESET ANALOG IN PTT SWITCH 1 8 PHONO SWITCH ch 5 JACK D6 J8 2 4
13. P1 DVSI Confidential Proprietary Type Single ended Connector RJ 4P4C Bandwidth 20 Hz to 4 kHz A D Sampling Rate 8 kHz A D Resolution 16 bits AMBE 4020 HDK Development Board User s Manual Version 1 1 Handset Pin Out RJ11 Connector P1 Section 5 Specifications 6 5 Electrical Input Pin Signal Name Pin 1 1 Connected to Ground 2 Connected to Ground 3 Speaker Out 4 Microphone In DC Microphone Bias out 6 4 Header Connections JTAG J5 Pin Number Name Pin Number Name 1 1v8 2 TMS 3 Digital Ground 4 TCK 5 Digital Ground 6 TDO 7 No Connection 8 TDI 9 No Connection 10 SYS_RESETn 11 No Connection 12 No Connection 13 No Connection 14 No Connection 15 Digital Ground 16 No Connection 17 Digital Ground 18 No Connection 19 Digital Ground 20 No Connection Power P5 Pin Number Name Center 5 Volts DC Shield Ground Input Voltage 5 Volts DC Input Current 250 ma 5V DC 6 6 Mechanical Weight 3 3 oz Size WxDxH 3 9 x 3 165 x 0 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 5 Specifications User s Manual Version 1 1 6 7 Board Dimensions 0 50 in E A A va mu mmm E eh E sp N ER O ie ei dE E E 5 o E Di SF 8 d o Sa 3 w a a a lt _Y a lt 2 87 in gt
14. Page 14 DVSI Confidential Proprietary AMBE 4020 HDK Development Board HDK Configuration User s Manual Version 1 1 SECTION HDK Configuration 3 DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 3 1 Overview The AMBE 4020 HDK Board is ideal for encoding and decoding speech Simply connect the AMBE 4020 HDK Board to a Windows based PC s USB interface configure vocoder rate and options then encode and decode files or process real time speech The AMBE 4020 HDK Board can play a key role in the development of communication systems that incorporate the AMBE 4020 vocoder chip The AMBE 4020 HDK Board incorporates a USB to serial UART Integrated Circuit Device manufactured by FTDI P N FT232R This allows designers to utilize FTDI s off the shelf drivers compatible with several operating systems for application customization and flexibility The AMBE 4020 HDK Board is configured to use the USB drivers offered by FTDI Visit the FTDI website at http www ftdichip com FT Drivers htm for more information 3 2 USB Driver installation To begin using the AMBE 4020 HDK Board connect it to an available USB port on the computer and install the required FTDI drivers These drivers are downloaded automatically set up the AMBE 4020 HDK Board to communicate on the PC s serial COM port The AMBE 4020 HDK Board has drivers available for both Windows 32 bit and Windows 64 bit operating systems The drive
15. User s Manual Version 1 1 7 2 Software Development Software development for use with the HDK can be accomplished by using freely available tools such as Microsoft s Visual Studio 2010 Visual Studio 2013 and Freescale s CodeWarrior MCU Special Edition This gives designers an opportunity to recompile the code to test other configurations 7 2 1 Additional Reference Material AMBE 4020 vocoder chip Users Manual http www dvsinc com literature htm E Page 49 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 7 Support User s Manual Version 1 1 PEN Support DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 8 1 DVSI Contact Information If you have problems or questions about the AMBE 4020 HDK Development Board please contact Digital Voice Systems Inc 234 Littleton Road Westford MA 01886 USA Phone 978 392 0002 Fax 978 392 8866 email info dvsinc com web www dvsinc com Technical support engineers are available Monday through Friday 9 00 AM to 5 00 PM eastern time and can be contacted by Phone 978 392 0002 Fax 978 392 8866 Email info dvsinc com World Wide Web htip www dvsinc com Page 50 DVSI Confidential Proprietary AMBE 4020 HDK Development Board User s Manual Version 1 1 8 2 Table of Revisions Section 7 Support O O c O Revision Date of e Number Revision Description P
16. as lt power mode gt 0 lpms 3 will transition the AMBE 4020 to Low Power Packet Mode Note that the baud rate must be lt 125000 baud prior to entering Low Power Packet Mode therefore lpms 3 should be used in conjunction with be 115200 or lower Packets will be processed in packet mode at a very slow rate since the AMBE 4020 clock rate is reduced Do not specify codec mode operation in combination with Ipms 3 Do not use lt power mode gt 4 or 5 here Power reduction is intended to be used at the end of a command via Ipme lpme lt power mode gt Specifies the power mode that is entered at the end of the command The power mode of the AMBE 4020 is set as specified by sending PKT_PMODE see AMBE 4020 User s Manual PKT_PMODE is sent to the AMBE 4020 after processing the speech data just prior to the time that hdk4kclient exits lpme 3 will transition the AMBE 4020 to Low Power Packet Mode Any subsequent hdk4kclient invocation can use Ipms O lpms 1 Ipms 2 or reset after which the AMBE 4020 will return to Packet Mode operation Note that the baud rate must be lt 125000 baud prior to entering Low Power Packet Mode therefore lpme 3 should be used in conjunction with bs 115200 or lower lpme 4 will transition the AMBE 4020 to Sleep Mode Any subsequent hdk4kclient invocation must use wakects wakerx or reset after which the AMBE 4020 will return to packet mode operati
17. command line It results in a pulse high then low being sent to the AMBE 4020 UART_CTS pin This wakes the AMBE 4020 from sleep mode The wake occurs prior to attempting to send any other packets Only one or fewer option from the set wakects wakerx reset break may be used on any hdk4kclient command line wakerx reset break This option can be used when the AMBE 4020 is known to be in Sleep Mode and it is necessary to wake it prior to performing the command specified by the remainder of the command line It results in a wake byte OxFF being sent to the AMBE 4020 UART RX pin This wakes the AMBE 4020 from sleep mode Note that a wake byte has the start bit low and all other bits high such that it is a single low pulse on the UART_RX pin The wake occurs prior to attempting to send any other packets Only one or fewer option from the set wakects wakerx reset break may be used on any hdk4kclient command line This option can be used at any time to request that the AMBE 4020 is reset prior to performing that actions specified by the remainder of the command Reset is reguired when the AMBE 40207M is in halt mode due to prior use of lpme 5 Only one or fewer option from the set wakects wakerx reset break may be used on any hdk4kclient command line This option resets the AMBE 4020 M by sending a break signal on UART_RX This in turn causes the AMBE 4020 to issue a sof
18. dis0 i 21 success 0 cbRet 0 12 19 14 12 19 14 HRZ SE 22 Saas BE HRZ ep Fe 222 SES ea Ele aea EC 14 ND 1 H 333 W 717 ListBox T 130 C 1024 TIZ0 CNT 1473917 4 4 Hdk4kclient exe program The hdk4kclient exe program is written entirely in C to facilitate easy modification by customers The software is compact yet includes all necessary code to arrange the channel packet protocol and communicate with the HDK through the dvsiserver executable program The source code for the hdk4kclient exe program is provided as an example to assist in the creation custom programs This software sets up and operates the HDK to demonstrate useful features of the AMBE 4020 Vocoder Chip and is a good reference to use as a starting point for more complex designs tailored to specific needs The HDK can be set up and controlled using a command prompt window and a command line interface program hdk4kclient exe The hdk4kclient program can be used to record audio input from various sources ADC AlC14 DMIC to a file play out encoded files to various outputs DAC or AIC 14 encode decode file to file or just simply passthru an audio source between the audio in to the audio out a A Page 20 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 Before starting the program an HDK device must be connected to the PC and the dvsiserver program dvsiserver exe must be started To
19. govern what the AMBE 4020 chip does when neither the encoder nor the decoder are running Refer to the AMBE 4020 Manual The recommend setting is PMODE 2 sleep The AMBE 4020 will enter sleep mode during intervals when both the ENC and DEC pins are low If PMODE 1 Low Power is selected then the AMBE 4020 will enter low power mode during intervals when both ENC and DEC are low If PMODE 0 Idle then the AMBE 4020 will remain in idle mode during intervals when both ENC and Page 35 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 DEC are idle Since this setting impacts power consumption with no tradeoff there is no case where any setting other than PMODE 2 Sleep is warranted The setting is retained to allow users to study the differences Possibly a user would want to reduce current variation for some reason 4 6 1 6 Skew Control Options Enable Skew Control When Enable Skew Control is not checked the AMBE 4020 is configured with skew control disabled Although the K10 microcontroller always generates a framing signal on the AMBE 4020 s IFRAME pin the AMBE 4020 ignores the signal when skew control is disabled Frame timing is derived from either the 12S sample clock or the AMBE 4020 s 4 Mhz Clock source See AMBE 4020 Manual When Enable Skew Control is selected checked it allows the AMBE 4020 Vocoder Chip to compensate fo
20. position 2 it crosses the output connection of the UART to permit two HDK boards to communicate without the need of a cross over cable When connection two HDK boards together only one of the HDK boards need to set these two switches into position 2 SW1 UART CHAN1 SW2 UART CHAN2 Table 5 HDK Switches Figure 7 Switches SW1 SW2 and S1 reset S2 Push to talk s Page 9 DVSI Confidential Proprietary AMBE 4020 HDK Development Board User s Manual Version 1 1 2 5 HDK Headers Section 2 Connectors Test Points amp Indicators The HDK provides a variety of Headers connections and jumpers see Figure 1 Basic block diagram of the AMBE 4020 HDK board HDK Headers Item Header of Pins Name J1 Header 5x1 PKT_TX PKT_RX PKT_CTS PKT_RTS J2 Header 5x1 IFRAME GFRAME J3 Header 3x1 USB UART TX DATA USB UART_RX DATA J5 Header 10x2 JTAG J9 Header 3x1 Analog In or Handset J10 Header 15x2 Daughter Card connection J11 Header 15x2 Daughter Card connection Table 6 HDK List of Headers J1 5x1Header Pins HDK Signal Name AMBE 4020 Signal Description PKT_TX_DATA UART receive data This is the input data signal for a conventional UART using 8 data bits no parity and 1 stop bit 8N1 Hardware flow control is used PKT_RX_DATA UART transmit data This is the output data signal for a conventional UART using 8 data bits no pa
21. run the hdk4kclient exe program open a command prompt window and change to the directory C HDK 4020 R001 bin that has the hdk4kclient exe program file in it and type in the desired command Alternatively the directory C HDK 4020 R001 bin may be added to your PATH environment variable 4 4 1 Example 1 Encoding a speech file using hdk4kclient exe C Command Prompt hdk4kclient exe r 40 enc bs 230400 tv dam dat output bit Figure 15 Encoding a speech file using hdk4kclient exe This example uses the HDK 4020 to encode the speech file tv dam dat example speech data provided with the HDK 4020 using AMBE 4020 rate index 40 4000 bps voice rate with no FEC The compressed speech data is written to a file named output bit The baud rate used for communication between the K10 microntroller and the AMBE 4020 is 230400 The AMBE 4020 is operated in packet mode for this command Note that for real time operation in packet mode a baud rate of at least 172800 is reguired 4 4 2 Example 2 Recording from AMBE 4020 on chip ADC using hdk4kclient exe CA Command Prompt oy Xx hdk4kclient exe r 0 enc seconds 10 adc record bit Figure 16 Recording from ADC using hdk4kclient exe This example uses the HDK 4020 to record 10 seconds of compressed speech data to the file record bit The AMBE 4020 rate index 0 2400 bps with no FEC is selected The source for the speech data is the AMBE 4020
22. s on chip ADC The AMBE 4020 is operated in codec mode Note that rather than specifying an input file name as in example 1 adc was specified as the input source Hdk4kclient exe recognizes adc dmic Gel and i2sh as codec mode input sources When specified they request that the AMBE 4020 is operated in codec mode and that the codec source data is obtained from the AMBE 4020 s on chip ADC the AMBE 4020 V s digital microphone input or the AIC 14 s line in or handset port of the optional codec daughter card When the input name does not match one of these special names the AMBE 4020 is operated in packet mode with speech data obtained from a file Page 21 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 4 4 3 Example 3 Decoding a channel file using hdk4kclient exe C Command Prompt hdk4kclient exe r 40 dec bs 230400 output bit output dat Figure 17 Decoding a channel file using hdk4kclient exe This example uses the HDK 4020 to decode the channel file output bit which was produced in example 1 Note that the rate index selected must match the rate index used in example 1 40 in this case The decoded speech data is written to a file named output dat The baud rate used for communication between the K10 microntroller and the AMBE 4020 is 230400 The AMBE 4020 is operated in packet mode for this command Note that for real
23. set of schematics is included with the AMBE 4020 HDK The manual is also available on DVSI s website http www dvsinc com brochures literature htm The AMBE 4020 Vocoder Chip User s Manual is available on DVSI web site www dvsinc com The User s manual describes the hardware and software features of the AMBE 4020 Vocoder Chip A Page 40 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 5 Specifications User s Manual Version 1 1 Specifications SECTION 6 DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 6 1 Overview This section contains hardware Specifications of the AMBE 4020 HDK Development Board NOTE All specifications are subject to change 6 2 Board Connections Digital Handset Interface Port P4 Type Connector RJ45 P4 Pin Out Pin Number Name Wire Color 1 DMIC CLK OUT White Green 2 Ground Green 3 DMIC RX DATA White Orange 4 1v8 Blue 5 PTT HANDSET White Blue 6 Ground Orange 7 ANALOG OUT SPEAKER _ White Brown 8 3v3A Brown UART Channel Data P5 Type RS 232 asynchronous Connector RJ45 UART Serial Port Pin Out Pin Number Name 1 4 6 Pins 1 4 and 6 Connected together 2 See Table 3 See Table 4 Connected to Pins 1 and 6 5 Connected to Ground 6 Connected to Pins 1 and 4 7 No Connection 8 No Connection
24. whenever the speech data is determined to be background noise or silence This silence frame contains information regarding the level of background noise which allows decoder to synthesize a Comfort Noise signal The comfort noise is intended to give the listener the feeling that they are still connected as opposed to producing absolute silence which can give the impression that the connection has been dropped Page 36 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 4 6 3 3 Input gain output gain The Gain Control allows adjustment to amplify or attenuate the incoming signal to maintain a relatively constant voice level The Input and Output gain can be set from 20dB to 20dB 4 6 4 Channel Model The Channel model is applied to the incoming channel data 4 6 4 1 Model e ideal Clean channel with no noise distortion or interference e Gauss Simulates distorted radio signals due to random background noise or amplifier noise This is done by adding normally distributed white noise to the data e Markov Simulates random changes in a radio signal and varies in time The distribution for this variable depends only on the distribution of the previous state e Rician Simulates multipath interference This is when a radio communication signal arrives at the receiver by several different paths or when at least one of the paths is changing lengthening or shorten
25. 020 0x0040 0x0080 0x0100 0x0200 0x0400 0x0800 0x1000 0x2000 0x4000 0x8000 The order in which the bytes are read from the file is as follows 0x01 0x00 0x02 0x00 0x04 0x00 0x08 0x00 0x10 0x00 0x20 0x00 0x40 0x00 0x80 0x00 0x00 0x01 0x00 0x02 0x00 0x04 0x00 0x08 0x00 0x10 0x00 0x20 0x00 0x40 0x00 0x80 Hard Decision Bit File A hard decision bit file contains compressed speech data output by the encoder The bit file can be used as input to the decoder The data is packed using 8 bits per byte For hard decision each bit must be 0 or 1 If the 16 bits a b c d e f g h i j K m N O p are the first 16 bits stored in a hard decision bit file Then the first two bytes of the file will be binary abcdefgh and ijklmnop where a and i are the msb of each byte Soft Decision Bit File A soft decision bit file contains compressed speech data output by the encoder that has then been converted to 4 bit soft decision format Soft decision format is not output directly by the encoder but it can be input directly to the decoder when soft decision decoding is specified The data is packed using two soft decision bits per byte Each soft decision bit must be a 4 bit value in the range from 0x0 to 0xF A binary O is represented as 0x0 0x1 0x2 0x3 0x4 0x5 0x6 or 0x7 with 0x0 being the most confident 0 and 0x7 being the least confident 0 A binary 1 is represented as OxF OxE OxD
26. Connections UART Serial Port Pin Out Analog Audio Input Source for AMBE 4020 TM E Signal Name ADG Number Jumper Between Jumper Between Pins 1 and 2 Pins 2 and 3 1 HANDSET Input HANDSET IN 2 AG E 3mm RCA JACK IN 3 3mm RCA Jack Audio Input Table 11 J9 Header Connections Analog Input Selection 2 5 1 Daughter Card Connections J10 Daughter card connection Ping 1 0 Function Name Description Output from the AMBE 4020 Vocoder Chip to Reset S E the external Codec on the daughter board Clock for external codec interface from the daughter o Outpur CODEC OER board input to the AMBE 4020 Vocoder Chip Frame Sync for the external codec interface from the 12 Output CODEC FS daughter board input to the AMBE 4020 Vocoder Chip PCM data for the external codec interface Output from 16 Input CODEC TX DATA the AMBE 4020 Vocoder Chip 19 Input 1200 SDA This pin is the data pin used to transfer configuration DVSI Confidential Proprietary Page 11 AMBE 4020 HDK Development Board Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 data to an external codec on the daughter board using the 12C protocol This pin is the clock pin used in the transfer of 23 Input 12C0_SCL configuration data to an external codec using the I2C protocol PCM data from the external codec interface Input to the AMBE 40207M Vocode
27. EC data from 2 0 Kbps to 9 6 Kbps in 50 bps increments This data rate flexibility makes the AMBE 4020 HDK a cost efficient design and development tool for high performance low bandwidth voice communication applications 1 2 AMBE 4020 HDK Features e The AMBEO 2 Vocoder with high quality speech compression and FEC data rates that can be set from 2000 bps to 9600 bps e The development kit includes circuit design details sample control software and reference documentation e Encode and decode files to from a PC through the USB interface The HDK 4020 is controlled via a command line interface on the PC Files can be encoded and compressed voice data files written to the PC Compressed voice data files can be decoded and speech files written to the PC Speech data from the ADC Digital Mic or optional AIC 14 daughter card can be recorded and encoded to a compressed voice data file stored on the PC A Compressed voice data file stored on the PC can be decoded and played out via the DAC or the optional AIC14 daughter card e Real time half duplex communication between two HDK boards using the UART and the analog 2 wire or 4 wire audio interfaces This mode is functional without reguiring a connection to the PC However a PC is needed to configure each HDK 4020 Since the configuration is stored in on board EEPROM the setup does not need to be tethered to any PC after configuration is complete e The HDK can be equipped with a AlC 14 codec
28. FYFN add acacia qu dadas dd Dad DDAN AEN 43 6 5 ELECTRICAL INPUT da dees I ict I Fd nb de EE 43 6 67 IMECHANICAL A uu E AET In EES Eeer 43 GZ BOARD DIMENSIONS sas sus udd DDIOD id bici 44 S APRENDI PEE E E E SEF O nad UG yN 46 LN RATE TABLES oi ee EE LG Ydy NI 46 2 SOFTWARE DEVELOPMEN Tai IN 49 7 2 1 Additional Reference Material 49 O TT el EE EE 50 8 1 DVSI CONTACT INFORMATION III I I I I III WN 50 9 2 TABLE OF REVISIONS LI ud Ud FO a fa yd WY Dd YF 51 List of Tables Table 1 HDK Gonneciors cs ue Eech a Tw Y FD WA e A aa 4 Table 2 Handset PIr out tu Eent EE EE DL Cd Nyd Y ce 7 Table 3 J9 Codec Input Selection nL LLY cnn 8 Table 4 Digital Mic Gonne tiol vita ii ii did 9 Table KIERMES ee Aere ed 9 Table 6 HDK List of Headers tara GLIR I AN 10 Table 7 J1 Header Connections YY YYA IAL LL AG L LL LL LLGC GL LLA IL LILI A IN 10 Table s J2 Fleadel iie un du ions pd TO ND dT ddu ab yl ale oe NTE DO a ad pte Dd N aa 10 Table 9 J3 Header Connections aeee I IL GI IA A GU 11 Table 10 J5 Header Connections eretas LI AAA A AN 11 Table 11 J9 Header Connections Analog Input Selection raras 11 Table 12 Daughter Board Connection JO 12 Table 13 Daughter Board Connection JI 12 Table 14 Test PONS eebe AE Ud DI dT dna A e au PTE DW du Uudd 12 Table 15 Board Status l EDS ee A A ydyn Lea 13 Table l6 Folder descriptiOl s ACEN ee DEE E venu Mareen 19 Table
29. HDK can then be used to simulate actual system conditions as a quality control reference standard Additionally the HDK can be used to batch process files for evaluation of the vocoder 1 4 What s Included with the HDK The development kit includes the following items AMBE 4020 HDK evaluation board Power Adapter 120v AC to 5 V DC AMBE 4020 HDK CD The most up to date version of the manual is always available at www dvsinc com brochures literature htm The AMBE 4020 HDK CD contains the AMBE 4020 User s Manual program source code for the on board microprocessor K10DX128VLF5 see Note and a PC executable with source for interfacing the HDK with a PC as well as a full set of schematics reference designs and test vectors Note The development tools for the K10DX128VLF5 are widely available and easily obtained from Freescale and various sources on the web This gives designers an opportunity to recompile the code to test other configurations The main tool tree is CodeWarrior MCU Special Edition This allows for a robust development environment free of cost up to 128KB http www freescale com Awebapp sps site prod summary jsp code CW MCU10 amp fpsp 1 amp tab Design Tools Tab 1 5 Additional analog audio UO interface The AMBE 4020 HDK provides a connection for a user designed daughter board for easy integration of an external codec board A Page 2 DVSI Confidential Proprietary AMBE 4020 HDK Development
30. IODXI28VLF5 VocoDER RESET DIGITAL HANDSET RJ45 2 PA Figure 15 HDK1 in RS232ENC Mode AMBE 4020 HDK RS232DEC Mode Block Diagram USB CONTROLLER Copec BOARD CONNECTOR HANDSET 1 0 7 RS 252 RJII TRANSCEIVER ANALOG OUT 4 1 8 PHONO AMBE 4020 Jack VOCODER CHIP llCONTROLLER KIODXI28VLF5 DECODER VOCODER RESET ul S2 Figure 16 HDK 2 in RS232DEC Mode 4 5 3 Configuration 2 HDK 1 in PTT Mode to HDK 2 in PTT Mode directly connects two AMBE 4020 HDK s together using the UART channel interface P5 Either AMBE 4020 HDK Vocoder board can encode speech from its analog input and send the encoded packet across the serial channel to be decoded by first AMBE 4020 HDK Development Board Each board can select either the handset or line in or DMIC input as the audio source When the PTT switch S2 is pressed the selected analog source is encoded and sent across the serial interface to the connected HDK Board where the incoming channel packets get decoded and played out on the selected audio output of the second HDK Board Page 31 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 AMBE 4020 HDK RS232PTT Mode Block Diagram USB HANDSET 1 0 CONTROLLER USB Fl CoDEC BOARD CONNECTOR U9 ES JO UART SWITCH E RS 252 UART o TRANSCEIVER RJL5 EO UART P5 ANALOG IN SWITCH 1
31. If outut file name is either dac or i2s then the AMBE 4020 is operated in codec mode When the encoder is specified enc option input file name is the file from which the speech input data data is obtained If adc dmic i2sh or Gel are secified in place of a file name they are treated specially They each indicate that the AMBE 4020 is operated in codec Page 23 AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 mode and specify the codec source Note that dmic reguires that a digital microphone is attached to P4 i2sh or i2sl reguire the optional codec daughter card i2sh selects the handset input on the daugter card wheras i2sl selects the line input When the decoder is specified dec option input file name is the file from which the compressed speech data data is obtained output file name or cmp compare file name When the encoder is specified enc option output file name is the name of the file in which the compressed voice data will be stored When the decoder is specified dec option output file name is the name of the file in which the decoded speech data will will be stored If dac or i2s are specified in place of a file name they are treated specially They each indicate that the AMBE 4020 is operated in codec mode and select the codec that receives the output dac specifies that the output goes to the AMBE 4020 s on chip DAC i2s specifie
32. K Users may modify the code as needed to suit their own application test purposes Note that the FTDI driver also exposes the HDK 4020 as a virtual COM port to the PC You can hook up a terminal emulator to the port and send test packets to the hardware R Page 6 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 2 3 HDK Audio I O Audio In Audio Out Handset Digital Handset Figure 5 Board Audio Connections 2 3 1 P1 Handset If a handset is used instead of the 2 wire interface use a standard telephone handset to connect to the RJ11 handset connector Be sure that the handset cord is less than 12 inches long included in the optional accessories kit when not stretched This will prevent excessive noise from being introduced into the voice signal When the DAC interface is selected the AMBE 4020 HDK Development Board always outputs the audio to both the 4 Wire and Handset output regardless of which voice source is selected 2 3 1 1 P1 Handset Analog Audio I O Handset I O Pin Signal Description 1 Comnected to Ground 2 Comnected to Ground 3 Speaker Out 4 Microphone In DC Microphone Bias out Table 2 Handset Pin out 2 3 2 3 5mm RCA Jacks The AMBE 4020 HDK Development Board provides two 3 5 mm jacks for the input and output of analog mono audio A typical analog audio input connection f
33. SB PG ConneChion sussurrar tos o GFTN 6 2 3 DK AUDIO VO iron tran ida FO 7 2 3 1 Ee EE 7 2 3 2 Sam HCA JACK cota denu i AS Fydd yna HAD WYDD YR FD 7 2 3 3 J9 Header RCA Line In or Handset Input Gelect 8 2 3 4 Digital Handset ia dat la dd dida hs 8 2 4 HDKBOARD SWITCHES uu eanu aig udd ddys End dd dantas eles ado ada falho dada cla ria 9 2 5 IDK HEADERS nu dydy Yu TF Tydy I east at DANFON ARWYR Pa 10 2 5 1 Daughter Card Connections ooooooicccconicononicnncccnonccononnnnnnnnnnnc coronan 11 26 HDKTESTRON TS odian GN LY iaa aL 12 2 7 HDK BOARD STATUS INDICATOR LEDS coooooconocccnnocnconcccnonnnnnancnannncnnncn nan nnnnnnnnnnnnccns 12 2 8 y ee 13 3 HDK CONFIGURATION eege eege eege 15 3 10 COVERVIE Wii el yall FD A CW FR a Y DU 15 3 2 USB DRIVER IWMSTALLATION cnn cn cnn rara aeee cnn rra ran arara nana nnccns 15 3 2 1 Driver installation example for Windows 2 15 A TT na 18 4 1 OPERATING MODES AEN 18 4 2 THDICSORTWARE ita oie diia 18 4 2 1 Installing HDK program files On Windows 18 4 3 DVSISERVER32 EXE PROGRAM cccccccscecececececaeeaeeeaeceaeseaeeeeeeseeseeeeeeeesaeeseeenaetaaes 20 4 4 HDK4KCLIENT EXE PROGRAM cooccoccnoncconccnnncnnn corn cno nn 20 4 4 1 Example 1 Encoding a speech file using hdk4kclient exe 21 4 4 2 Example 2 Recording from AMBE 4020 on chip ADC using EE 21 4 4 3 Example 3 Decoding a channel file using hdk4kclient exe 22 4 4 4 Example 3 Playing a channel file to the AMBE 4020
34. Serial device should appear under Ports COM amp LPT as USB Serial Port COMXX where XX is the port number of the USB interface E B 0 E E E E E T 0 0 6 DI 17 USB 3000 COMIS ED Processors Sound video and game controllers lt gt Storage controllers ZK System devices Universal Serial Bus controllers Intel R ICH9 Family USB Universal Host Controller 2934 Intel R ICH9 Family USB Universal Host Controller 2935 Intel R ICH9 Family USB2 Enhanced Host Controller 293A Intel R ICH9 Family USB2 Enhanced Host Controller 293C Unknown Device USB Composite Device USB Root Hub Unknown Device USB Composite Device USB Root Hub USB Root Hub USB Serial Converter USB 3000 UNS E Device Manager o Action View Help H m E 5 4 Computer H Disk drives A Display adapters 3 DVD CD ROM drives 3 4 Human Interface Devices IEEE 1394 Bus host controllers Imaging devices 2 Keyboards D Mice and other pointing devices amp Monitors amp Network adapters 17 Ports COM amp LPT m Figure 13 Windows Device Manager showing the AMBE 4020 HDK on COM 15 DVSI Confidential Proprietary Page 16 AMBE 4020 HDK Development Board User s Manual Version 1 1 HDK Configuration Note Write down the Com Port that is being used for the USB Driver this value will be reguired to run the AMBE 4020 HDK Bo
35. a bits out the RS232 UART to a connected HDK unit e Call Progress Tone e Dial Ring Busy Ring UK e Single tones 4 6 8 HDK Statistics Statistics displays various information about the HDK functions TX Frames The number of Transmitted frames since the last configuration change RX Frames The number of Received frames since the last configuration change Dec Frame The number of Decoded frames since the last configuration change Seconds The number of seconds since the last configuration change FE Count The number of framing errors on the RS 232 interface OR Count The number of overrun errors on the RS 232 interface Slips The number of frames that have slipped This occurs when the HDK board is receiving frames from another HDK at a lower rate than the AMBE 4020 is decoding them The AMBE 4020 automatically compensates for this e Erasures The number of frames that have been erased This occurs when the HDK board is receiving frames from another HDK at a higher rate than the AMBE 4020 is decoding them The AMBE 4020 automatically compensates for this e Actual BER The number of bit errors as a percentage of total bits that were added to the incoming channel data by the channel model selected e Repeats The number of Repeated frames due to bit errors e Mute The number of frame mutes due to bit errors e Detected BER The number of bit errors detected by the FEC This sho
36. age 1 0 March 2015 Initial Release Edit Figure 18 Transmit and Receive LEDs 1 1 May 2015 Added Rate 63 to Table 18 Vocoder Rates 47 NOTES Page 51 DVSI Confidential Proprietary
37. al documents training materials specifications or diagrams that pertain to or are delivered with the PRODUCT in any manner including in print on CD ROM or on line 1 2 DVSI has developed a number of voice coding methods and algorithms the Technology which include DVSI s Advanced Multi Band Excitation AMBEG AMBE and AMBE 2 voice coders The Technology codes speech at low bit rates and may include error correction echo cancellation and other auxiliary functions 1 3 DVSI Voice Compression Software shall mean the voice coding Software that implements or embodies the Technology and is embedded into or otherwise provided with the PRODUCT 1 4 DVSI Voice Codec shall mean the DVSI Voice Compression Software any PRODUCT Hardware into which the DVSI Voice Compression Software is embedded or executed and any associated Documentation 1 5 DVSI represents that it owns certain Proprietary Rights in the PRODUCT including patent rights copyrights trademarks and trade secrets These rights include one or more of the following US Patents 5 630 011 5 649 050 5 701 390 5 715 365 15 754 974 5 826 222 5 870 405 6 161 089 6 199 037 6 912 495 7 634 399 7 957 963 7 970 606 8 036 886 8 200 497 8 315 860 and 8 359 197 and under other US and foreign patents and patents pending AMBE AMBE and AMBE 2 are trademarks of Digital Voice Systems Inc 1 6 END USER shall mean the perso
38. ard USB control program In Figure 13 the COM port is shown as COM15 NOTE If the Device is shown with a yellow exclamation point then the USB driver is not completely installed To fix this uninstall the Device disconnect the AMBE 4020 HDK Board from the PC s USB port and then reconnect the AMBE 4020 HDK Board to the PC s USB port and allow MS Windows to find new hardware Then follow the instructions to reinstall the device Page 17 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 SECTION Operation 4 DIGITAL VOICE SYSTEMS INC 4 1 Operati ng Modes The Speech Compression Specialists The HDK provides different operating modes to allow testing and evaluation of data to and from the AMBE 4020 vocoder chip at various stages along the data path This gives the user the opportunity to understand how the AMBE 4020 vocoder chip needs to be implemented and how to use the HDK as a tool to verify a new design 4 2 HDK Software The AMBE 4020 HDK Vocoder board is set up controlled and operated from a PC The board can also be configured to boot into a particular mode for stand alone operation see section 4 6 HDK 4kcontrol exe User Interface In order for the PC to work with the HDK a USB cable must be used and USB drivers must be installed See the USB PC Connection Section on how to install the USB drivers Once the connection between the PC and the HDK is estab
39. controls how frequently silence frames are transmitted N 0 indcates that silence frames are always transmitted N 1 indicates that every other silence frame is transmitted N 2 indicates that every third silence frame is transmitted N 9999 indicates that every 10000 silence frame is transmitted N 10000 is a special case where silence frames are never transmitted When N gt 0 is enabled in conjunction with dec the DTX simulation is enabled at the decode side Before decoding a frame of bits first a check is made to see if the frame of bits is all ones If the frame is all ones then the decoder sets the CNI flag indicating that no channel data was received such that the decoder should generate comfort noise If the frame does not contain all ones then it is passed to the decoder for normal decoding and the CNI flag is not set Note that the DTX simulation is implemented in the microcontroller software Page 29 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 4 5 Connecting two HDK s together The AMBE 4020 HDK can be directly connected to a second AMBE 4020 HDK using the UART channel interface P5 This physical link establishes a real time half duplex communication connection between the two units The connected HDKs can be run in either of two configurations The HDK Board implements an asynchronous UART serial interface for chan
40. daughter card to provide an analog audio I O interface e Full Control of AMBE 4020 Vocoder Chip advanced capabilities such as Soft decision decoding FEC Voice Activity Detection VAD adaptive Comfort Noise Insertion CNI and DTMF Single tones e Low power requirements allow the board to be powered with only a 5 Volt DC power adapter 1 3 AMBE 4020 HDK Description The AMBE 4020 HDK is a completely functional system from the analog audio interface to the digital channel interface The straightforward design of the board provides a variety of user interfaces and test points that allow designers to rapidly prototype their own AMBE 4020 designs Digital Voice Systems AMBE 4020 Vocoder Chip is the core of the AMBE 4020 HDK All of the supporting chips on the board were chosen for their low cost ease of use and wide availability Page 1 DVSI Confidential Proprietary AMBE 4020 HDK Development Board User s Manual Version 1 1 Section 1 Introduction The AMBE 4020 HDkK is also a stand alone voice processing board equipped with connections for analog audio I O a RS 232 UART communication channel interface and a Digital Microphone interface port The AMBE 4020 HDK can demonstrate the capabilities and benefits of the AMBE 4020 vocoder chip in real time without investing much time in engineering and product development Once a new product design is complete and manufacturing begins the AMBE 4020
41. e hdk4kclient version hdk4kclient rboot 1 3 rboot file name hdk4kclient wboot 1 3 wboot file name Page 22 DVSI Confidential Proprietary AMBE 4020 HDK Development Board User s Manual Version 1 1 the options available are as follows 4 4 6 enc dec alaw be lt baud rate gt break bs lt baud rate gt dec dec sdbits 1 dec sdbits 4 or_ decsd dgain G dix N egain G enc input file name lpme lt power mode gt lpms lt power mode gt n serial number noparity ns O output file name or cmp compare file name passthru t R or r OXNNNN OxNNNN OxNNNN OxNNNN 0xNNNN 0xNNNN rboot N rbootname reset seconds S skew M tone ldx Amp ulaw version wakects wakerx wboot N wbootname Table 17 hdk4kclient exe options hdk4kclient exe options descriptions input file name DVSI Confidential Proprietary Operation Specifies an encode operation If input file name is the name of a file then the AMBE 4020 is operated in packet mode If input file name is either adc dmic i2sl or i2sh then the AMBE 4020 is operated in codec mode Specifies a decode operation If output file name is the name of a file or if cmp compare file name is specified then the AMBE 4020 is operated in packet mode
42. e under and shall be governed by and construed in accordance with the laws of the Commonwealth of Massachusetts USA except that body of law governing conflicts of law If any provision of this Agreement shall be held unenforceable by a court of competent jurisdiction that provision shall be enforced to the maximum extent permissible and the remaining provisions of this Agreement shall remain in full force and effect This Agreement has been written in the English language and the parties agree that the English version will govern AMBE 4020 HDK Development Board Information Section User s Manual Version 1 1 Special Handling Instructions To avoid damage from the accumulation of a static charge industry standard electrostatic discharge precautions and procedures must be employed during handling and installation the AMBE 4020 HDK Development Board Read Instructions and Users Manual All of the safe handling and operating instructions should be read before integration of the AMBE 4020 HDK Development Board begins Failure to exercise reasonable care and to follow all instructions and heed all warnings may result in injury to property or to individuals Retain Instructions The handling and operating instructions should be retained for future reference Follow Instructions All operating and use instructions should be followed Storage To insure maximum shelf life in long term storage AMBE 4020 HDK Development board
43. ee AMBE 4020 User s Manual for more information about available rate indices Additional custom rates may be selected by specifying six 16 bit rate words using the format shown passthru Specify passthru codec mode Passthru mode allows speech samples stored in a file to be played out directly to a codec Passthu mode also allows samples recorded from a codec to be stored directly to a file without coding Examples 1 hdk4kclient dec passthru speech dat dac speech in the file speech dat is played out on the AMBE 4020 on chip DAC 2 hdk4kclient enc passthru adc speech dat speech obtained from the AMBE 4020 on chip ADC is saved in the file speech dat passthru should not be used in conjunction with packet mode ns 0 Disable the AMBE 4020 noise suppressor Page 27 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 This option is used in conjunction with enc By default the AMBE 4020 noise suprressor is enabled Using ns 0 disables the noise suppressor dec sdbits 1 Specify hard decision decoding The channel data input to the decoder uses hard decision format where each byte contains 8 hard decsion bits dec sdbits 4 or decsd Specify soft decision decoding The channel data input to the decoder uses soft decision format where each byte contains 2 4 bit soft decsion bits alaw Specify a law companding When used i
44. eir respective manufacturers All Rights Reserved Data subject to change AMBE 4020 HDK Development Board User s Manual Version 1 1 Information Section AMBE 4020 HDK Development Board END USER License Agreement Important Read Carefully 1 Preliminary Statements and Definitions 1 1 This nonexclusive end user product license agreement is a legal agreement between the customer the END USER and Digital Voice Systems Inc DVSI covering the terms and conditions under which DVSI s proprietary content that may consist of and is not limited to software hardware documentation and other material is licensed to the END USER as part of this PRODUCT a The PRODUCT shall mean the Hardware Software Documentation and other materials that were provided by DVSI either directly or indirectly through distributors or agents to END USER as part of a sale delivery or other transaction b Hardware can be in the form of Integrated Circuits such as Digital signal Processors Circuit boards and electronics enclosed in a chassis DVSI s AMBE 3003 Vocoder Chip is an example of an Integrated Circuit c Software can be in form of computer code firmware masked into an IC or stored or embedded into ROM or RAM or Flash memory or software stored on any media such as CD ROM floppy disk hard drive solid state memory or the Internet d Documentation means written or electronic information including user manuals technic
45. etary AMBE 4020 HDK Development Board Section 5 Specifications User s Manual Version 1 1 27 7200 4400 2800 28 8000 4000 4000 29 9600 2400 7200 30 9600 3600 6000 31 2000 2000 0 32 6400 3600 2800 33 Not available 34 Not available 35 Not available 36 Not available 37 Not available Not available Not available 52 Not available 53 Not available 54 Not available 55 Not available 62 Not available 63 3600 2400 1200 Table 18 Vocoder Rates File Formats The hdk4kclient exe program uses three types of files for storing input and or output data transferred to from the HDK 40207M The 3 file formats are as follows PCM File A PCM file is a binary file that contains 16 bit PCM speech samples sampled at 8 kHz The file does not contain any header information It contains only speech data The data may be input to the encoder or output from the decoder Each speech sample occupies two successive bytes in the file The first byte contains the least significant 8 bits of the PCM sample and the second byte contains the most significant 8 bits of the PCM sample To illustrate this assume that the following 16 bit PCM samples are stored in a POM file Page 47 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 5 Specifications User s Manual Version 1 1 0x0001 0x0002 0x0004 0x0008 0x0010 0x0
46. f or is directly related to the cause of action 10 Taxes 10 1 All payments required under Section 4 or otherwise under this Agreement are exclusive of taxes and END USER agrees to bear and be responsible for the payment of all such taxes except for taxes based upon DVSI s income including but not limited to all sales use rental receipt personal property or other taxes which may be levied or assessed in connection with this Agreement 11 Export 11 1 United States export laws and regulations prohibit the exportation of certain products or technical data received from DVSI under this Agreement to certain countries except under a special validated license Some of the restricted countries include Libya Cuba North Korea Iraq Serbia Taliban in Afghanistan Sudan Burma and Iran The END USER hereby gives its assurance to DVSI that it will not Knowingly unless prior authorization is obtained from the appropriate U S export authority export or re export directly or indirectly to any of the restricted countries any products or technical data received from DVSI under this Agreement in violation of said United States Export Laws and Regulations DVSI neither represents that a license is not reguired nor that if reguired it will be issued by the U S Department of Commerce Licensee shall assume complete and sole responsibility for obtaining any licenses reguired for export purposes 12 Governing Law 12 1 This Agreement is mad
47. for input from a digital microphone see example circuit in the AMBE 4020 Vocoder Chip Users Manual The digital mic interface provides a robust digital signal input that helps demonstrate the versatility and superior performance of the AMBE 4020 Vocoder Along with the DMIC_IN the RJ45 connection also provides access to the Push to Talk PTT switch and an analog output that can be used to connect to an external earpiece E a Page 8 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 RJ45 Connector P4 Pin Signal Name Description 4 DMIC_CLK_OUT This is the output of the 1 92 MHz clock from the AMBE 4020 Vocoder Chip Ground 2 3 DMIC RX DATA 4 The speech data from a digital microphone input to the AMBE 4020 1v8 1v8 voltage connection When this line is switched to ground through a 5 PTT_HANDSET 100 ohm resistor it enables the Push To Talk feature of the AMBE_4020 Vocoder Chip 6 Ground 7 ANALOG_OUT_SPEAKER Analog output signal with no gain 8 3v3A 3v3 voltage connection Table 4 Digital Mic Connection 2 4 HDK Board Switches Board Switches tem Name Description S1 Reset When pressed this switch resets the HDK board This switch controls the Push To Talk feature of the S2 PTT Handset AMBE 4020 Vocoder Chip When these two switches are in
48. ing causing fading in the signal to occur 4 6 4 2 BER Level Simulates Bit errors in the radio channel interface due to a weak or noisy signal This input allows users to enter the number of bit errors into the channel data The best way to adjust this variable is to monitor the Actual BER within the statistics box until the desired bit error rate is achieved 4 6 4 3 Fade Simulates the radio channel fading out due to interference or a weak signal This input allows users to simulate fading 4 6 4 4 Soft Decision Decoding Soft decision decoding provides significant improvement in FEC performance by making a finer estimation of the received energy prior to sending it to the decoder When the Soft Decision Decoding is selected checked the AMBE 4020 Vocoder Chip utilizes a 4 bit soft decision decoder to make the decision of whether or not the channel data is a 1 or a O 4 6 5 Input Output levels Monitor These boxes display the digital signal levels at the input and output of the AMBE 4020 chip ST stands for short term whereas LT stands for long term Min tracks the smallest sample value whereas Max tracks the largest sample value The indicators can be used to monitor for proper signal levels 4 6 6 DTMF KNOX Tones The AMBE 4020 Vocoder Chip is capable of detecting transmitting and synthesizing DTMF tones KNOX tones call progress tones and single frequency tones When the encoder detec
49. input analog speech into digital speech samples encodes the speech using the selected vocoder rate and then sends the compressed bit stream out as serial data packets over the UART interface Simultaneously the compressed bit stream from the other HDK are read in from the UART interface and decoded back into digital speech samples The decoded samples are converted back into analog speech via the codec whose output is sent to both the handset and RCA line level output connections 2 2 3 USB PC Connection The USB connection on the AMBE 4020 HDK provides system setup mode of operation and file I O via PC Control and operation of the HDK Board is configured through the USB interface To connect the AMBE 4020 HDK to a PC s USB port a USB Type A to Mini B cable is required included with the HDK To use the USB interface it is first necessary to install a USB driver The USB connection is interfaced to a UART on the K10 microcontroller via an FTDI USB to UART converter The port settings for this UART are 921 600 baud 8 N 1 with hardware flow control Note that there is not a direct connection for packets from the PC to the AMBE 4020 All packets must be relayed through the K10 microcontroller The demo program hdk4kclient exe or hdk4kcontrol exe is used to control the AMBE 4020 HDK via the USB interface These programs utilize the D2XX driver interface of the FTDI chip The source code for the demo programs is distributed with the HD
50. kcontrol exe make sure dvsiserver32 exe is running Then launch hdk4kcontrol exe by clicking on its icon or a shortcut to it Menu controls are disabled until you select an available HDK 4020 device via its serial number and then click the Connect button Upon successful connection product name and version information will be displayed within the HDK Device box the Connect Disconnect button will now display Disconnect and the remaining Menus become enabled Upon establishing a connection to the HDK 4020 hdk4kcontrol exe will obtain the menu settings from the HDK s EEPROM The user may change any of the menu items to effect the current configuration of the HDK Doing so causes packets to be sent immediately to the HDK to achieve the reguested configuration Any time the HDK s current configuration differs from the configuration stored in EEPROM then Recall Config and Save Config buttons become enabled Clicking Recall Config Page 33 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 will discard any menu settings that were changed and return to the configuration stored in the HDK s EEPROM Clicking Save Config will save the current menu configurations into the HDK s EEPROM Two HDK s can be connected together via the RS 232 interface After the HDK EEPROM has been configured to the desired settings a connection to the PC is no longer required
51. les All sub directories named u contain the encoded file data clean bit dam bit and irstia bit from the original u law test vector file These compressed speech files were encoded recorded at a data rate as indicated by the rate index number of the higher level directory The folder also contains the decoded data files in pcm format clean dat dam dat and irstia dat from these encoded files as well as the converted u law clean u dam u and irstia u files from the decoded dat files All sub directories named g contain the encoded file data dam bit from the original pcm test vector file The compressed speech file was encoded recorded at a data rate as indicated by the rate index number of the higher level directory with Gaussian bit errors The number of bit errors is indicated by the number following the g as follows 901 1 bit errors 902 2 bit errors 905 5 bit errors g10 10 bit errors The number after the bit error identifier is either a 1 or a 4 this indicates that the files were processed with 1 bit hard decision or 4 bit soft decision decoding 2 a Page 19 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 In addition to the sample files there are three executable files and several sample scripts to facilitate testing operations 4 3 Dvsiserver32 exe program The DVSI server program dvsiserver32 exe is used to establi
52. lished the HDK software should be installed on the PC The AMBE 4020 HDK Development Board kit includes a CD with a PC executable programs hdk4kclient exe dvsiserver32 exe hdk4kcontrol exe These programs should be copied from the CD into a user created directory located on a C drive named CAHDK 4020 R001 The executable programs enable the user to record audio input from various sources to a file play out encoded files to various outputs encode and decode file to file or just simply passthru an audio source as well as set up an HDK to HDK communication link The HDK can be controlled via a command line executable hdk4kclient exe in a COMMAND PROMPT window or by using the provided GUI interface executable hdk4kcontrol exe The DVSI Vocoder Device Server executable dvsiserver32 exe must be started prior to running either of these two programs 4 2 1 Installing HDK program files On Windows 2 Step 1 Create a folder named CAHDK 4020 R001 on the PC Step 2 Copy the entire contents of the CD provided with the HDK into this folder Step 3 When the copying of all the contents is finished go to the CAHDK 4020 R001 directory and unzip tv zip file to CAHDK 4020 R001 v This compressed data file contains test vectors that may be used for vocoder testing Step 4 Before continuing on review all of the documentation in the CAHDK 4020 R001 Docs directory 2 Step 5 Verify correct operation of the board by using the hdk4kclient exe program as de
53. n accordance with this agreement 4 2 This Agreement shall terminate automatically without notice from DVSI if END USER fails to comply with any of the material terms and conditions herein END USER may terminate this Agreement at any time upon written notice to DVSI certifying that END USER has complied with the provisions of Section 3 4 3 Upon termination of this Agreement for any reason END USER shall i return the PRODUCT and documentation purchased or acquired or in Licensee s possession to DVSI ii have no further rights to any DVSI Software or the Technology without a separate written license from DVSI iii discontinue all use of the PRODUCT All confidentiality obligations of Customer and all limitations of liability and disclaimers and restrictions of warranty shall survive termination of this Agreement In addition the provisions of the sections titled U S Government End User Purchasers and General Terms Applicable to the Limited Warranty Statement and End User License shall survive termination of this Agreement Payments 5 1 In consideration of the materials delivered as part of the Product and in consideration of the license granted by DVSI for the PRODUCT and in consideration of DVSI s performance of its obligations hereunder the END USER agrees to pay to DVSI the fees as specified in DVSI s invoice Payments of fees shall be received by DVSI prior to shipment of the PRODUCT Proprietary Notices
54. n and or organization to whom the DVSI Vocoder Product software or hardware was delivered or provided to as specified in the purchase order or other documentation In the event that the END USER transfers his rights under this license to a third party as specified in Section 3 0 then this third party shall become an END USER 1 7 DVSI reserves the right to make modifications and other changes to its products and services at any time and to discontinue any product or service without notice 2 License Granted 2 1 Subject to the conditions herein and upon initial use of the DVSI Product DVSI hereby grants to END USER a non exclusive limited license to use the DVSI Voice Compression Software and Technology within the PRODUCT No license is granted for any use of the DVSI Voice Compression Software or Technology on any other device or Hardware or in any manner other than within the original unmodified PRODUCT purchased from DVSI No license is granted to copy or modify the DVSI Voice Compression Software or the PRODUCT either in whole or in part 2 2 No license right or interest in any trademark trade name or service mark of DVSI is granted under this Agreement END USER acknowledges that the PRODUCT may contain trade secrets of DVSI including but not limited to the specific design and associated interface information 2 3 END USER shall not copy extract reverse engineer disassemble de compile or otherwise reduce the DVSI V
55. n conjunction with enc the speech data in the input speech file are assumed to contain a law compressed samples When used in conjunction with dec the speech data in the output speech file will be a law compressed Used with packet mode only ulaw When used in conjunction with enc the speech data in the input speech file are assumed to contain u law compressed samples When used in conjunction with dec the speech data in the output speech file will be u law compressed Used IN packet mode only rboot N rbootname Read boot configuration N from AMBE 4020 EEPROM 1 lt N lt 3 The boot configuration data for the specified boot configuration is output to the file rbootname in binary format wboot N wbootname Write to boot configuration N in the AMBE 4020 EEPROM 1sNs3 E a A Page 28 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 The boot configuration data in the file wbootname is written to the specified boot configuration within the AMBE 4020 EEPROM tone Idx Amp Force transmission or generation of a tone When used in conjunction with enc the encoder is forced to transmit channel data representing a tone with the specified tone index and amplitude Note that not all vocoder rates support in band tone signaling for all tone types see AMBE 4020 User s Manual The guality is lower for tones that are not supported via in band
56. nel data using a protocol designed by DVSI 4 5 1 Half Duplex Communication Setup and Control To set up a half duplex communication link between two HDK boards each board must be individually configured and then the connection P5 to P5 between the two boards can be made using a standard CAT5 Ethernet cable In order for two boards board HDK 1 to connect to board HDK 2 one board board HDK 1 has to switch both SW1 and SW2 to position 2 and the other board board HDK 2 leaves the switches in position 1 Both boards HDK 1 and HDK 2 must be set to the same vocoder rate III G el A AR sl mu WY EL E mm a ebe a El El 3 Figure 14 SW1 and SW2 shown in Position 1 4 5 2 Configuration 1 HDK 1 in RS232ENC Mode to HDK 2 in RS232DEC Mode The analog voice from the first HDK 1 Board is encoded and sent across the serial interface to the second HDK 2 Board where the incoming channel packets get decoded and played out on the selected audio output of the second HDK Board Page 30 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 AMBE 4020 HDK RS232ENC Mode Block Diagram USB CONTROLLER Copec BOARD CONNECTOR u9 UART alts SWITCH HANDSET 1 0 RS 252 Rail TRANSCEIVER Uu UART P5 SWITCH ANALOG IN SW2 RESET UCONTROLLER SWITCH si 1 8 PHono AMBE 4020 JACK VOCODER CHIP K
57. oice Compression Software to human readable form END USER shall not alter duplicate make copies of create derivative works from distribute disclose provide or otherwise make available to others the DVSI Voice Compression Software and Technology and or trade secrets contained within the PRODUCT in any form to any third party without the prior written consent of DVSI The END USER shall implement reasonable security measures to protect such trade secrets 2 4 This is a license not a transfer of title to the DVSI Voice Compression Software Technology and Documentation and DVSI retains ownership and title to all copies 3 Transfer of License 3 1 The END USER shall have the right to transfer the rights under this Agreement to a third party by either i providing the third party with a copy of this Agreement or ii providing the third party with an agreement written by the END USER hereinafter END USER Agreement so long as the END USER Agreement is approved in writing by DVSI prior to transfer of the PRODUCT The END USER Agreement shall contain comparable provisions to those contained herein for protecting the Proprietary Information from disclosure by such third party Third parties shall agree to accept all the terms and conditions under either Agreement or the END USER Agreement Term and Termination 4 1 This Agreement is effective upon initial delivery of the PRODUCT and shall remain in effect until terminated i
58. on Note that the baud rate must be lt 125000 baud prior to entering Low Power Packet Mode therefore lpme 3 should be used in conjunction with be N where N lt 125000 Note that the AMBE 4020 consumes less power in Sleep Mode but it cannot receive any packets until it returns to Packet Mode Upon receiving a transition on the UART_CTS pin achieved using wakects or a wake byte on the UART RX pin achieved using wakerx the AMBE 4020 will return to Packet Mode and any prior settings will be retained Another way of returning to packet mode is to issue a hard reset achieved using reset but this takes longer and results in prior settings being lost meainging that the AMBE E Page 25 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 4020 would need to be reconfigured No packets can be processed in Sleep Mode but the AMBE 4020 can be readies for operation quickly lpme 5 will transition the AMBE 4020 to Halt Mode Any subsequent hdk4kclient invocation must use reset after which the AMBE 4020 will return to packet mode operation Halt Mode is the AMBE 4020 s lowest power mode but it can not process any packets and requires a reset before operation can resume wakects This option can be used when the AMBE 4020 is known to be in Sleep Mode and it is necessary to wake it prior to performing the command specified by the remainder of the
59. on chip DAC using haK4kclieht amp X amp eseu didas 22 4 4 5 More hdk4kclient exe options oooocococcconncccicccononccconcncnanccnarcnorannnnnno 22 4 4 6 hdk4kclient exe options descriotions rei 23 4 5 CONNECTING TWO HDK S TOGETHER nn nr 30 4 5 1 Half Duplex Communication Setup and Control 30 4 5 2 Configuration 1 HDK 1 in RS232ENC Mode to HDK 2 in RS232DEC Mode 30 4 5 3 Configuration 2 HDK 1 in PTT Mode to HDK 2 in PTT Mode 31 4 6 HDK4KCONTROL EXE USER INTERFACE ccccceeeeeeeceeeceeeceeeeeeeeeeeeseeeeseeesaeeseeenaeeaaes 32 4 6 1 HDK Options solia ias 34 4 6 2 Vocoder Bit Ral sata o eek reed 36 AMBE 4020 HDK Development Board Section Table of Contents User s Manual Version 1 1 4 6 3 VOCOdEr Options vis Gen un Fd iddu dL RIO ore He 36 4 6 4 Channel Model sed SEENEN ES 37 4 6 5 Input Output levels Monitot rrenan 37 4 6 6 DTMF KNOX Tones occccccconccoccciccccnonononaniconococonononaniconoconononanicnnnnnns 37 4 6 7 Call Progress Tones Selection Buttons 38 4 6 8 FADER STATISTICS ti ii i n 38 5 DOCUMENTATION amp SOFTWARE DEVELOPMENT sccssccssccssecceeccseeceeeneeeees 40 5 1 HDKRS 232 UART DATA PACKET STRUCTURE ee IN 40 52 DOCUMENTATION urticaria Ud iach 40 G SREGIFICA TIONS EE 41 Gall OVERVIEW Aa O EAA AA A E A1 6 2 BOARD GONNECTIONS iard dee co ODD jah dada MANON DYL aa dA la Danda aa ga a Da 41 6 3 AVD VO edel dE 42 6 4 HEADER CONNECTIONS iaidd GY dedd D
60. or the HDK would be to connect the audio line output of an audio component such as a digital tape player or even a PC sound card output to the analog input jack audio cables not included of the AMBE 4020 HDK Development Board The E Page 7 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 AMBE 4020 M HDK Development Board outputs the analog signal on the output 3 5 mm jack that may be connected to an amplifier or Audio In jack on a PC sound card The unit always outputs the audio to both the 4 Wire and Handset output regardless of the voice source selected 2 3 3 J9 Header RCA Line In or Handset Input Select This jumper allows the user to select between the Line In RCA 3 5mm plug or the handset RJ11 analog audio I O J9 3x1 Header RCA Line In Handset Select Jumper Installed Between Pins 1 2 Audio Source is Handset Jumper Installed Between Pins 2 3 Audio Source is Line In Table 3 J9 Codec Input Selection GE Jumper Installed for Handset I O J91to2 Jumper Installed for 3mm RCA Jack UO J92to3 EI Figure 6 Analog Audio IO Selection Jumper 2 3 4 Digital Handset The AMBE 4020 chip is designed to interface with the ADMP421 Omnidirectional Microphone from IvenSense http www invensense com mems microphone inmp421 html The AMBE 4020 HDK provides a RJ45 connection
61. ptional daughter card as the source for audio input to the AMBE 4020 DG interface I2S AIC 14 LINE Selects the AMBE 4020 I2S interface as the speech input interface to the AMBE 4020 and chooses the Line In jack on the optional daughter card as the source for audio input to the AMBE 4020 DG interface e ADC Selects the AMBE 4020 ADC interface as the speech input interface to the AMBE 4020 Choose whether the handset or line is connected to the ADC using J9 a Page 34 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 e DMIC Selects the AMBE 4020 DMIC interface as the speech input interface to the AMBE 4020 4 6 1 3 Output This selects the desired speech output e l2S AIC14 This option selects the 12S interface as the AMBE 4020 speech output interface This option requires the optional daughter card e DAC This option selects the internal DAC interface as the AMBE 4020 speech output interface The internal DAC is connected to both the handset or analog output RCA jack 4 6 1 4 Push to Talk Mode DEC Sub Option When RS232PTT mode is selected the DEC sub option is available Within the Push to Talk Options box choose one of the following options to determine when the decoder runs DEC ENC amp RX The decoder runs when the encoder is not running and RS 232 data is received on P4 There may be times when neither the encoder nor decoder are
62. r Chip 24 Output CODEC_RX_DATA 2 6 10 14 17 18 20 21 22 25 26 27 28 29 30 Digital Ground 1 3 5 7 9 11 13 15 1 8 Volt Supply Table 12 Daughter Board Connection J10 2 5 1 1 Daughter Board Connection J11 J11 Daughter card connection Pin s Function Description 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 Ground Analog Ground 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 3v3 3 3 volts Table 13 Daughter Board Connection J11 2 6 HDK Test Points Test points allow the user to access the data to and from the AMBE 4020 Vocoder Chip By connecting to these test points the user can monitor the data flow and to understand the operation of the chip For more detailed explanation of the I O signal refer to the AMBE 4020 Vocoder Chip Users manual HDK Board Header Test Points Item Name Description TP1 Reserved TP2 Reserved TP3 DEC Monitor the AMBE 4020 DEC signal TP4 ENC Monitor the AMBE 4020 ENC signal TP5 OFRAME Monitor the AMBE 4020 OFRAME signal TP6 IFRAME Monitor the AMBE 4020 IFRAME signal Table 14 Test Points 2 7 HDK Board Status Indicator LEDs AMBE 4020 HDK Development Board uses LEDs as a convenient way to display the current condition of Audio I O vocoder and communications channel to the operator The LED indicators indicate the status of the HDK board as follo
63. r drift between the frame and sample rate clocks The K10 generates a nominal 50 Hz framing signal that is connected to the AMBE 4020 s IFRAME signal The AMBE 4020 encoder and decoder run synchronous to IFRAME which means transmitted packets are also synchronous to IFRAME IFRAME Hz When Enable Skew Control is selected checked the AMBE 4020 Vocoder Chip adjusts the frame boundaries so that they occur on the rising edge of the IFRAME signal This input allows the user to adjust the IFRAME signal between 48 75Hz lt IFRAME lt 51 25 Hz so that the frame size vary between 156 and 164 samples 4 6 2 Vocoder Bit Rate 52 rates from the AMBE 4020 vocoder chip can be selected from the Vocoder rate selection drop down menu For information what rates are available refer to Table 18 Vocoder Rates 4 6 3 Vocoder Options The Vocoder options are features that are found on the AMBE 4020 Vocoder Chip For more details about any of these refer to the AMBE 4020 Vocoder Chip Users Manual 4 6 3 1 Enable Noise suppression The integrated Noise suppressor feature is used to reduce the effect of background noise in the encoder input signal The Noise suppressor is applied to both silence frames and voice frames but not tone frames 4 6 3 2 Enable DTX The Discontinuous Transmission DTx feature is used to reduce transmit power during times of conversational silence When DTx is selected the encoder will output a silence frame in band
64. rity and 1 stop bit 8N1 Hardware flow control is used PKT_CTS Flow control output signal The signal is low when the chip is ready to receive data on UART_RX The signal is high when the chip is not ready to receive data on UART_RX Sending data to the chip when UART_RTS is high may result in errors PKT_RTS Flow control input signal When the signal is low the chip is allowed to transmit data on UART_TX When the signal is high the chip stops transmitting data on UART_TX Note that if UART_CTS is set high while a transmission is in progress data flow will not be stopped until transmission of the current byte completes Ground Ground Table 7 J1 Header Connections J2 Header 3 Pin Signal Description 1 DEBUG_TERM 2 3 Ground Ground 4 UART_CHAN1 5 UART_CHAN2 Table 8 J2 Header DVSI Confidential Proprietary Page 10 AMBE 4020 HDK Development Board h Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 J3 3x1 Header Pins Signal Description 1 Ground Ground 2 USB UART RX DATA USB Data to the PC 3 USB UART TX DATA USB data from the PC Table 9 J3 Header Connections J5 10x2 Header Pins Signal Description 1 1v8 2 TMS 3 5 15 17 19 Ground 4 TCK 6 TDO 7 9 11 12 13 14 16 18 20 No Connect 8 TDI 10 SYS RESETn Table 10 J5 Header
65. rol Software Window conc LA nan 33 Figure 20 HDK 4020 Control Panel 34 Figure 21 AMBE 4020 HDK dimensions erre narran rr rra rra 44 Figure 22 Custom External Codec Board 45 AMBE 4020 HDK Development Board User s Manual Version 1 1 Section 1 Introduction SECTION Introduction 1 DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 1 1 Overview The Digital Voice Systems Inc DVSI AMBE 4020 HDK Development Board is a comprehensive evaluation test and development platform that helps product designers and manufacturing engineers gain experience with the low bit rate AMBE 4020 Vocoder Chip The AMBE 4020 HDK is ideal for comparing voice quality at various rates analyzing the compressed voice data I O stream and establishing interface requirements This valuable knowledge gives engineers the insight required to start prototyping their own low bit rate communication systems guickly and easily thereby decreasing development costs and speeding up a new product s time to market The AMBE 4020 HDK employs DVSI s AMBE 4020 vocoder chip that is ideal in communication systems including push to talk land mobile radio satellite and wireless telephony The AMBE 4020 Vocoder Chip contains proprietary software that implements the Advanced Multi Band Excitation AMBE voice compression algorithm The AMBE 4020 Vocoder Chip is capable of data rates containing compressed speech and F
66. rs must be installed the first time a new AMBE 4020 HDK Board is connected to the PC Once the driver is installed Windows will automatically re load the driver each time the AMBE 4020 HDK Board is re connected 3 2 1 Driver installation example for Windows 7 Connect the AMBE 4020 HDK Board to an available USB port on the PC Windows 7 indicates it is beginning to install the driver e X Installing device driver software Click here for status Vd 1210PM Figure 11 Installing driver software indicator Windows 7 begins driver installation Windows 7 then finishes installing the driver for the COM port and displays the software for this device has been successfully installed Click X to close the balloon Page 15 DVSI Confidential Proprietary AMBE 4020 HDK Development Board User s Manual Version 1 1 ML Your device is ready to use Device driver software installed successfully Figure 12 AMBE 4020 HDK Board drivers are installed and ready to use HDK Configuration To verify the drivers are installed and find out which COM port it was assigned use Windows Device Manager To open Windows Device Manager Click Start click Run and then type devmgmt msc without the guotation marks Alternatively open the Device Manager located in Control PanelNSystem then select the Hardware tab and click Device Manger and select View gt Devices by Type the USB
67. running therefore this is the most power conscious setting DEC ENC The decoder runs when the encoder is not running If the decoder is running while no RS 232 data is received on P4 then comfort noise is produced by the decoder DEC 1 From the user perspective this is the same as DEC ENC However from a hardware perspective the DEC input to the AMBE 4020 is held high when this method is selected This menu control works by directing the K10 on the HDK on how to manage the ENC and DEC pins of the AMBE 4020 Vocoder Chip The ENC and DEC pins of the AMBE 4020 Vocoder Chip determine whether the encoder or decoder are running at any given time When DEC ENC amp RX then the K10 controls ENC such that it is high when the button is pressed and low otherwise It controls DEC such that it is high when ENC is low and RS 232 data is being received on P4 When DEC ENC the K10 controls ENC such that it is high when the button is pressed and low otherwise It controls DEC such that it is high when the button is not pressed When DEC 1 ENC is high when the button is pressed and DEC is always high This achieves the same end result because the AMBE 4020 Vocoder Chip is half duplex and if both ENC and DEC are high only the encoder runs 4 6 1 5 Push to Talk Mode PMODE Sub Option When RS232PTT mode is selected the PMODE sub option is available Within the Push toTalk Options box the user may select the power mode settings that
68. s that the output goes to the AIC14 on the optional codec daughter card via the AMBE 4020 s 12S inerface If cmp compare file name is specified instead of simply an output file name then hdk4kclient does not store the results in a file Instead it compares the produced output to the expected output which is contained in the file compare file name This option is useful for testing purposes version This should be specified without any other options It will send a packet to the AMBE 4020 to guery its product ID and version strings The resulting strings are displayed q Causes the program to be less verbose Less stuff is displayed n serial number Hdk4kclient addresses the HDK 4020 whose serial number matches serial number This is useful in cases where multiple HDK 4020s are attached to the computer but itis desired to address a particular HDK 4020 Note that the serial numbers of available HDK 4020s are displayed within the dvsiserver32 exe window If this option is not specified then hdk4kclient addresses any available HDK 4020 bs lt baud rate gt Specifies the initial baud rate used A packet is sent to the HDK 4020 to change the baud rate used by the UART that connects the K10 microcontroller to the AMBE 4020 Note that the baud rate used at the FTDI to K10 microcontroller is always 921600 baud The baud rate is changed before any other packets are sent to the AMBE 40207M Typical baud rates are 57600
69. s under numbered Processed Number of Hard or Soft Folder X fileformat Gaussian bit Decision Decoding errors CAMHDK 4020 R001MwW X a a law 0 1 bit Hard decision CAMHDK 4020 R001WvVVX GO1 1 pcm 1 1 bit Hard decision CAHDK 4020 R00 NV XAGO1 A pcm 1 4 bit Soft Decision CAHDK 4020 R001WvVX GO2 1 pcm 2 1 bit Hard decision CAMHDK 4020 R001MW X GO2 4 pcm 2 4 bit Soft Decision CAHDK 4020 R001WvVX GO5 1 pcm 5 1 bit Hard decision CAMHDK 4020 R001MWX GO5 4 pcm 5 4 bit Soft Decision CAHDK 4020 R001WvVVX G10 1 pcm 10 1 bit Hard decision CAMHDK 4020 R001MWX G10 4 pcm 10 4 bit Soft Decision CAMHDK 4020 R001WvVVX u u law 0 1 bit Hard decision Table 16 Folder description The a and u are sub folders that contain the encoded clean bit dam bit and irstia bit and the decoded clean dat dam dat and irstia dat at the index rate of the numbered directory from the original 8 bit a law and law audio files sampled at 8kHz All sub directories named a contain the encoded file data clean bit dam bit and irstia bit from the original a law test vector file These compressed speech files were encoded recorded at a data rate as indicated by the rate index number X of the higher level directory The folder also contains the decoded data files in pcm format clean dat dam dat and irstia dat from these encoded files as well as the converted a law files clean a dam a and irstia a from the decoded dat fi
70. scribed in section 4 4 Hdk4kclient exe program Also included on the HDK CD disk are sample speech and compressed speech files The tv zip file has three test vectors in various formats data rates without with bit errors and hard soft decision decoding The files supplied in the root directory of the tv zip file are the original test vector files named and formatted as follows e clean dat dam dat and irstia dat are 16 bit pcm audio files sampled at 8kHz e clean a dam a and irstia a are 8 bit a law audio files sampled at 8kHz e clean y dam M and irstia u are 8 bit u law audio files sampled at 8kHz a A Page 18 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 The 52 file folders in the root directory of the tv zip file contain these three files processed at the index rate as indicated by the folder name For example folder named 0 contains files processed at rate index 0 Inside each of these numbered folders X are sub directories that contain processed files in various formats without with bit errors and hard soft decision decoding see Table 16 Folder description The base of the numbered directory X has files encoded clean bit dam bit and irstia bit and decoded clean dat dam dat and irstia dat at the index rate of the numbered directory from the original pcm files in the root directory Sub Directorie
71. sh a link between the PC and the connected HDK devices This program must be running before starting either hdk4kclient exe or hdk4kcontrol exe programs To run dvsiserver32 exe double click on the executable When the program starts it will poll the USB ports to find any connected HDK devices each one will then be listed in the window opened by the program For information about each of the connected device just hover the mouse over the device serial number in the window Dvsiserver32 exe effectively translates the D2XX driver interface of the HDK into a message pipe To communicate with any device a client program simply opens a message pipe to the device and sends packets through the message pipe The server can establish a connection to many devices and can expose these devices to clients upon request The server takes care of all the hardware details such as setting up the baud rate flow control timeouts etc View Options Tools Ignore Debug DIGITAL VOICE SYSTEMS INC The Speech Compression Specasis Serial Description Loc ID Status Bytes Bytes TX Activity Client Message Y1FYDS HDK 4020 Wm don 730 feik J i 26 success 0 cbRet 0 dis0 i 29 success 0 cbRet 0 dis0 i 30 success 0 cbRet 0 dis0 i 31 success 0 cbRet 0 dis0 i 2 success 0 cbRet 0 dis0 i 7 success 0 cbRet 0 dis0 i 9 success 0 cbRet 0 dis0 i 11 success 0 cbRet 0 dis0 i 14 success 0 cbRet 0 dis0 i 16 success 0 cbRet 0 dis0 i 17 success 0 cbRet 0
72. should be kept in an a static shield moisture controlled package at lt 40 C and lt 90 Relative Humidity Installation Ventilation The AMBE 4020 HDK Development Board unit should be situated so that its location or position does not interfere with proper ventilation and air circulation around the board Heat The AMBE 4020 HDK Development Board unit should be situated away from devices that could act as a heat source such as an amplifier Power Sources The AMBE 4020 HDK Development Board should be connected to a power source only of the type described in this Users Manual AMBE 4020 HDK Development Board Section Table of Contents User s Manual Version 1 1 Table of Contents Preliminary 1 INTRODUCTION ue un iy ed ce etc ato dei LG o do UY 1 Wed OVER VIEW Sis eu erate Hin id au dod Ea o ONR ad YC YM 1 1 2 AMBE 4020 HDK FEATURES nn YL YR FYR LL LEL LL LLE nnn uo 1 1 3 AMBE 4020 HDK DESCRIPTION cc nn nono ncnnn corn nan LY LL nn L o 1 1 4 WHAT S INCLUDED WITH TnEHDk nano nan LY nn nn nn nu 2 1 5 ADDITIONAL ANALOG AUDIO I O INTERFACE ccocooccoccnccnnonccnnnnnnnccnnccnnnconncon aca nn nn nn nno 2 2 CONNECTORS TEST POINTS amp INDICATORS 0occccoccoccconnnccnnnncrennanrrrnannnennons 3 2 1 OVERVIEW OF HDK INTERFACES essere cera nee ane ane aanaaaananada 3 2 2 HDK POWER AND INTERFACE CONNECTIONS ins LY LY nL nn nnd nno 5 2 2 1 DE Power Placido 5 2 2 2 RS 232 UART Connection inneu LY YH RHY EEE 5 2 2 3 U
73. signaling When used in conjunction with dec the decoder is forced to synthesize the specified tone In band signaling is not reguired for this feature therefore all tones are fully supported by all vocoder rates skew M dtx N Enable skew control and specify IFRAME clock rate This option is used in conjunction with codec mode When specified skew control is enabled and the IFRAME clock rate is specified via M where IFRAME_Hz 3 125 MHz M such that when M 62500 IFRAME_Hz 50 Hz Small adjustments to M allow slight adjustments to the IFRAME frequency 48 75 lt IFRAME Hz lt 51 25 This will slightly alter the rate at which the HDK 4020 transmits voice frames lt also alters the rate at which it decodes frames The decoder can compensate for cases where it receives frames at a different rate than it decodes them by inserting or deleting a frame as necessary This is known as a frame slip or a frame erasure Infrequent slips or erasures do not significantly effect voice quality The IFRAME signal is generated by the K10 microcontroller This option causes a special packet to be sent to the HDK 4020 causing the K10 microcontroller to change the freguency of IFRAME Enable Discontinuous Transmission DTX simulation When DTX is enabled in conjunction with enc the bits for certain silence frames are replaced with all ones Replacing the channel data with all ones is used to simulate frames that are not transmitted N
74. t reset The break signal on UART_RX is not sufficient to wake the AMBE 4020 from Halt Mode Only one or fewer option from the set wakects wakerx reset break may be used on any hdk4kclient command line egain G Specify encoder gain egain G may be used in conjunction with enc for either codec mode or packet mode to specify a gain in dB to be applied by the encoder When not specified the default gain is O dB 20 lt G lt 20 Page 26 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 dgain G Specify decoder gain dgain G may be used in conjunction with dec for either codec mode or packet mode to specify a gain in dB to be applied by the decoder When not specified the default gain is O dB 20 lt G lt 20 noparity By default all packets sent to the AMBE 4020 have parity bytes enabled When this option is used parity bytes are disabled at the start of the command and then re enabled at the end seconds S When encoding in codec mode the default record duration is 15 seconds This option changes the record duration to S seconds r R or r OXNNNN OXNNNN OxNNNN OxNNNN 0xNNNN 0xNNNN Specify the vocoder bit rate This option is used in conjunction with enc or dec By default the AMBE 4020 vocoder rate index selected is index 32 3600 bps voice 2800 bps FEC 6400 bps total r R allows any other rate index to be selected S
75. time operation in packet mode a baud rate of at least 172800 is reguired 4 4 4 Example 3 Playing a channel file to the AMBE 4020 on chip DAC using hdk4kclient exe C Command Prompt hdk4kclient exe r 40 dec bs 230400 output bit dac Figure 18 Playing a channel file to the AMBE 4020 DAC using hdk4kclient exe This example is similar to example 3 except that instead of writing the decode speech data to a file it is played out on the AMBE 4020 s on chip DAC The AMBE 4020 is operated in codec mode Note that rather than specifying an output file name as in example 3 dac was specified instead Hdk4kclient exe recongnizes two special output sources dac and i2s When specified they indicate that speech output should be played out through the specified codec interface rather than being written to a speech file They also request that the AMBE 4020 is operated in codec mode rather than packet mode Note Before running hdk4kclient exe be sure that the dvsiserver32 exe program is running 4 4 5 More hdk4kclient exe options We have introduced hdk4kclient using a few examples but hdk4kclient exe supports more advanced options This section will provide more details about the hdk4kclient exe command line options hdk4kclient exe supports the following generic command line formats hdk4kclient enc options input file name output file name hdk4kclient dec options input file name output file nam
76. ts a tone it passes the tone data in band within the regular voice data bits so that tones pass seamlessly from the encoder to the decoder for synthesis The decoder synthesizes a tone in response to reception of an in band tone frame Refer to the AMBE 4020 Users Manual for more information on Tone Detection and Generation 2 a Page 37 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 4 6 6 1 Type e DTMF Select this to transmit or generate a DTMF Tone e Knox Select this to transmit or generate a KNOX Tone 4 6 6 2 Duration e Input how long of a tone to generate number in ms 4 6 6 3 XMT GEN Select XMT to transmit the tone over the Channel as in band data or select GEN to generate a synthesized DTMF Tone locally at the decode side 4 6 6 4 XMT GEN level Enter the value of the transmitted or generated Tone Amplitude in dBm0 4 6 6 5 XMT GEN Single tone index Enter the index of the tone to transmit or generate by its Index Number Refer to the table in the AMBE 4020 Users Manual Note that as you change the index the corresponding frequency is displayed on the button within the Single Tones box 4 6 7 Call Progress Tones Selection Buttons When any of one these buttons are clicked the HDK will either depending of the XMT or GEN selection synthesize the selected tone type tone locally or pass the tone data in band within the regular voice dat
77. ts employees shall create a warranty or in any way increase the scope of this warranty and END USER may not rely on any such information or advice The limited warranties under this Section 8 give END USER specific legal rights and END USER may have other rights which vary from state to state 9 Limitation of Liability The END USER agrees that the limitations of liability and disclaimers set forth herein will apply regardless of whether the END USER has accepted the product or service delivered by DVSI 9 1 In no event shall DVSI be liable for any special incidental indirect or conseguential damages resulting from the use or performance of the PRODUCT whether based on an action in contract or for applications assistance or product support or tort including negligence or otherwise including without limitation damages for loss of business revenue profits business interruption and loss of business information or lost or damaged data even if DVSI or any DVSI representative has been advised of the possibility of such damages 9 2 Because some states or jurisdictions do not allow the exclusion or limitation of liability for conseguential or incidental damages the above limitations may not apply to END USER 9 3 DVSI s maximum liability for damages arising under this Agreement shall be limited to 2096 twenty percent of the fees paid by END USER for the particular PRODUCT that gave rise to the claim or that is the subject matter o
78. uld track the Actual BER as long as there is sufficient FEC selected to correct the errors induced by the channel Page 38 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Operation User s Manual Version 1 1 model When the number of bit errors begins to exceed the error correction capability the Actual BER and the detected BER will diverge 2 a Page 39 DVSI Confidential Proprietary AMBE 4020 HDK Development Board Documentation amp Software Development User s Manual Version 1 1 SECTION Documentation amp Software Development 5 DIGITAL VOICE SYSTEMS INC The Speech Compression Specialists 5 1 HDK RS 232 UART Data Packet Structure On the RS 232 UART interface the baud rate is automatically adjusted to use the lowest baud rate that will accommodate the selected vocoder bit rate On the RS 232 interface 20 ms frames are delimited by single byte idle periods that occur every 20 ms The K10 microcontroller is able to find the start of a vocoder frame by detecting the idle byte In this way the idle byte serves as a synchronization method Other than the idle byte all of the remaining data is compressed voice data All packet formatting including the header byte and channel packet fields are stripped out prior to transmitting over the RS 232 interface The baud rate is calculated as follows bps 400 x105 J 99 RS 232 Baud Rate 80 x100 100 5 2 Documentation A
79. warranty does not apply if the Product a has been altered b has not been installed operated repaired or maintained in accordance with instructions supplied by DVSI c has been subjected to abnormal physical or electrical stress misuse negligence or accident 8 2 Except as stated in Section 8 1 the PRODUCT is provided as is without warranty of any kind DVSI does not warrant guarantee or make any representations regarding the use or the results of the use of the PRODUCT with respect to its correctness accuracy reliability speech guality or otherwise The entire risk as to the results and performance of the PRODUCT is assumed by the END USER After expiration of the warranty period END USER and not DVSI or its employees assumes the entire cost of any servicing repair replacement or correction of the PRODUCT 8 3 DVSI represents that to the best of its Knowledge it has the right to enter into this Agreement and to grant a license to use the PRODUCT to END USER 8 4 Except as specifically set forth in this Section 8 DVSI makes no express or implied warranties including without limitation the warranties of merchantability or fitness for a particular purpose or arising from a course of dealing usage or trade practice with respect to the PRODUCT Some states do not allow the exclusion of implied warranties so the above exclusion may not apply to END USER No oral or written information or advice given by DVSI or i
80. ws Page 12 DVSI Confidential Proprietary AMBE 4020 HDK Development Board h Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 LED ID ff Description when LED ON Color when LED ON D1 Vocoder Reset Red D6 Board Reset Red D11 3 3 V Power on Green D12 3 3 V Power on Green D19 Mode dependent Red D20 Mode dependent Red Table 15 Board Status LED s Figure 8 LED locations 2 8 Board Reset When the AMBE 4020 HDK reset switch is pressed the HDK goes through the following sequence 1 The K10 microcontroller boots up initially into USB packet mode The K10 UARTs are initialized the AMBE 4020 is reset and communication between the K10 and AMBE 4020 is established The HDK is ready to receive packets via the USB interface after it sends an HDK_READY packet 2 If no packets are received via the USB interface within the first 250 ms after reset then the K10 microcontroller will access the configuration data stored into its on chip EEPROM and use it configure the board This facilitates stand alone dual HDK operation no PC required The EEPROM can be configured using the hdk4kcontrol exe GUI program Page 13 DVSI Confidential Proprietary AMBE 4020 HDK Development Board h Section 2 Connectors Test Points amp Indicators User s Manual Version 1 1 A E ni e ei WI TT TT WII e WS Figure 10 Reset LEDs s R

AMBE-4020™-HDK Manual - Digital Voice Systems

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AMBE-4020&trade;-HDK Manual - Digital Voice Systems

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AMBE-4020™-HDK Manual - Digital Voice Systems